QuickOPC UABrowseDialog: Configuring Property Filtering

Distinguish OPC UA Properties from Attributes

With Mode.SelectElementType set to UAElementType_Node, QuickOPC hides attributes. A node such as EURange is not an attribute; it is an OPC UA Property node. Because Properties are nodes, selecting node elements can still expose them in the browse results.

BrowseDialog := TUABrowseDialog.Create(nil);
BrowseDialog.Mode.SelectElementType := UAElementType_Node;
BrowseDialog.Mode.MultiSelect := true;
BrowseDialog.ShowDialog(nil);

Set SelectElementType to UAElementType_Attribute only when the dialog must select attributes. That change does not solve Property-node filtering because Properties remain nodes.

Configure Property Filtering

QuickOPC 2017.1 Beta added the IncludeProperties property to UABrowseMode and UADataDialog. Use that property to determine whether Property nodes are included in browse results. The evidence does not specify the Delphi property syntax or default value, so confirm both against the installed QuickOPC documentation.

Avoid Accidental Recursive Selection

The dialog provides different selection actions. The middle button adds the selected node and everything below it recursively. Selecting a tag through that button can therefore add its Property nodes, such as EURange, and can produce a large selection when the branch contains many nodes. The simple down-arrow button selects nodes individually.

1. Use the simple down-arrow when users must add one node at a time.
2. Avoid the recursive middle button unless the complete subtree is required.
3. If the installed version supports IncludeProperties, configure it to exclude Properties from browse results when the application must hide them.

Verify the Dialog Behavior

First record the exact QuickOPC version because Property filtering was introduced in QuickOPC 2017.1 Beta. Browse to a Variable that exposes a Property such as EURange, then compare the simple down-arrow with the recursive middle button. Verify that individual selection adds only the intended node, recursive selection adds descendants, and the configured IncludeProperties setting produces the required browse results.

FAQ